// A flat-imported module authors its OWN `Box { a }`, a DISTINCT nominal from
// main's same-name `Box { m }`. The parameterised-impl protocol type-ARG `*Box`
// registers SOURCE-AWARE against main's `Box` (own-wins), never the global
// last-wins author.
Box :: struct { a: i32; }

dep_box :: () -> i32 {
    b : Box = ---;
    b.a = 9;
    return b.a;
}